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‣
Process Control and Instrumentation
Comments
Question
The transfer function for a PID controller is (where, ?
i
is the integral (reset) time and ?
D
is the derivative time.)
Options
A.
K
c
(1 + ?
i
s
+ ?
D
).
s
B.
C.
D.
Correct Answer
Process Control and Instrumentation problems
Search Results
1. Smoke density of the flue gas going out of the chimney is measured by a
Options
A. polarograph
B. thermal conductivity meter
C. photo electric cell
D. chromatograph
Show Answer
Scratch Pad
Discuss
Correct Answer: photo electric cell
2. Which of the following measurements can be made by the measurement of emf?
Options
A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
D. All (a), (b) & (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: All (a), (b) & (c)
3. A negative gain margin expressed in decibels means a/an __________ system.
Options
A. stable
B. unstable
C. critically damped
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: unstable
4. A proportional controller with a gain of
K
c
is used to control a first order process. The offset will increase, if
Options
A.
K
c
is reduced.
B.
K
c
is increased.
C. integral control action is introduced.
D. derivative control action is introduced.
Show Answer
Scratch Pad
Discuss
Correct Answer:
K
c
is increased.
5. Instrumentation in a plant offers the advantage of
Options
A. greater safety of operation
B. better quality of product
C. greater operation economy
D. all (a), (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c)
6. The __________ of a vapor pressure thermometer is a secondary element.
Options
A. pointer
B. Bourdon tube
C. bulb
D. none ofthese
Show Answer
Scratch Pad
Discuss
Correct Answer: Bourdon tube
7. Pick out the wrong statement.
Options
A. O
2
, NO and NO
2
exhibit paramagnetic properties as a result of unpaired electrons.
B. CO
2
is the strongest paramagnetic gas.
C. Paramagnetic susceptibility of gases decreases with temperature.
D. Paramagnetic susceptibility of gases permits the measurement of their concentration.
Show Answer
Scratch Pad
Discuss
Correct Answer: CO
2
is the strongest paramagnetic gas.
8. The closed loop pole of a stable second order system could be
Options
A. both real and positive.
B. complex conjugate with positive real parts.
C. both real and negative.
D. one real positive and the other real negative.
Show Answer
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Discuss
Correct Answer: both real and negative.
9. Working principle of radiation pyrometer is based on the
Options
A. Wien's law
B. Kirchoffs law
C. Stafan-Boltzman law
D. Seebeck effect
Show Answer
Scratch Pad
Discuss
Correct Answer: Stafan-Boltzman law
10. A magnetic flowmeter is
Options
A. based on the principle of Faraday's law.
B. capable of measuring the flow rate of slurries and electrolytes.
C. based on the linear relationship between the fluid flow rate and the induced voltage.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
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